One of the best bitcoin faucet available on android devices in my opinion is called BitMaker. I’ve been using it for a while now and it’s the easiest and highest paying one that I’ve found. You can earn 250 satoshi every 30 minutes by watching a quick ad and there’s a bunch of ways to earn even more satoshi. The minimum to withdrawal is also really low so you can withdrawal several times a week. I suggest checking it out if you haven't already!
500 Sats per hour is so low. And the disadvantage of it is you are required to download the App. How if this app is a virus ? How do we know that this app is good ? It could be good if they are supporting browser, add-on and android app. But the problem is 500 Sats per hour ? Other faucet are giving almost 1250 per 2 hours. And the only thing to do is to wait it and solve a captcha and claim your price.
The amount of Satoshi's that are released should not be fixed, it should change dynamically with the price changes of the Bitcoin price, in real time. A faucet that does this would be Freebitco.in but it's not on Android. I do not use any faucet that needs to install any software for it to be used. You never know what nasty code is hidden in it's faucet script. ^hmm^